OK, let's crack this. We're given 658 and our task is to multiply it by 3. Essentially, we'll be adding 658 to itself 3 times.
Step 1: 0 + 658 = 658
Step 2: 658 + 658 = 1316
Step 3: 1316 + 658 = 1974

So, 658*3 = 1974